The London Road Cash Exchange store has been found not only to have an air rifle in the window display, but a sign outside advertises the store at South London Air Gun Centre.

A sign on the pavement even says they are happy to buy and sell new and used airguns, air rifles and accessories.

In addition, the same address is being used on Google Maps for Cash Exchange as well as "Morden Airgun Centre".

The business is also operating as "South London Airgun Centre" and a listing on Google exists at the same address in Norbury for "Morden Airgun Centre" (Image: Steve Reed MP)

Not only did the MP for Croydon North tweet about the gun in the window, but he's written a letter to the company in an effort to stop any future airgun sales. In it, Mr Reed asked the company to stop immediately "in the name of decency and public safety".

"It beggars belief that you have chosen to do this at a time when people across London, including in Norbury, are increasingly alarmed at the upsurge in violent crime across the country," wrote the former Lambeth Council leader.

A collection of airguns is displayed in the window of Cash Exhange in Norbury (Image: Steve Reed MP)

"Air guns are dangerous weapons. Most people, finding one pointing in their face, would not be able to tell if it was a real gun or not."

He also highlighted that air guns "can cause serious harm and injury to people who are shot with them."

He goes on to day that there is a process whereby air guns can be converted into a lethal weapon.

The Labour MP said on Twitter that "advertising guns in a shop window encourages the use of guns on our streets".

He concludes his letter, informing the company's managing director that police, Croydon Council and the Home Secretary will all be spoken to about the gun shop and what can be done to stop it.

Airguns are legal in England, though may only be owned or purchased by over-18s. There is also a legal limit on how powerful they can be without having a firearm certificate as well as rules on where they can be fired.

We have been unable to reach Cash Exchange for comment on the situation. The company has not publicly responded several tweets by the Croydon North MP about the store.

The letter was dated November 30, and it is not yet clear if Cash Exchange have taken any action in response to it.